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Geochronological and geochemical constraints on the petrogenesis and geodynamic process of Hemler,Vlinder,and Il'ichev seamount lavas in NW Pacific

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Science China Earth Sciences 2024年第6期67卷 1856-1871页

作者： Xun WEI Yan ZHANG xuefa shi Hui ZHANG Key Laboratory of Marine Geology and Metallogeny First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Laboratory for Marine Geology Qingdao Marine Science and Technology CenterQingdao 266237China Shandong Key Laboratory of Deep Sea Mineral Resources Development(Preparatory) Qingdao 266061China

Oceanic intraplate volcanoes with linear age progressions are usually accepted to be derived from melting of an upwelling mantle *** seamount groups in NW Pacific,however,show complex age-distance relationships that are difficult to explain using the classic“mantle plume hypothesis”,and thus their origins are *** this study,we present ^(40)Ar-^(39)Ar age,geochemical,and Sr-Nd-Pb-Hf isotopic data of lavas from Hemler,Vlinder,and Il’ichev seamounts in NW Pacific,to elucidate their petrogenesis and geodynamic *** lavas from Hemler,Vlinder,and Il’ichev seamounts are classified as alkali basalt,basanite/nephelinite,and *** with Mg O>8 wt.%exhibit high contents of CaO,FeO^(T),and TiO_(2),similar to the composition of melts formed from reaction between carbonated eclogite-derived melts and fertile *** lavas have elevated Zr/Hf ratios(40.6-45.2)and negative Zr and Hf anomalies,indicating the presence of a carbonate component in the mantle *** are enriched in incompatible trace elements and have enriched mantle 1(EM1)-like SrNd-Pb-Hf isotopic *** isotopic compositions of Vlinder,Il’ichev basanite,and Hemler lavas in this study are similar to the Rarotonga *** occurring at the same seamount,the Il’ichev alkali basalts display more depleted SrNd-Hf isotopic compositions compared to Il’ichev *** to plate tectonic reconstruction results,the ages of Hemler(100.1 Ma),Vlinder pre-(100.2 Ma)and post-shield(87.5 Ma),and Il’ichev(56.4 Ma)lavas clearly deviate from the Macdonald,Arago,Rarotonga,and Samoa hotspot tracks,indicating that they cannot directly originate from mantle *** propose that in the mid-Cretaceous,when the Pacific plate passed over Rarotonga hotspot,melting of Rarotonga plume formed the Vlinder(main-shield stage),Pako,and Ioah *** Rarotonga(and possibly Samoa)plume materials would have been dispersed into the surrounding asthenosphere by mantle conve

关键词： Mantle plume Magellan seamount trail Carbonated mantle component Hotspot Lithosphere extension

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Potassium isotopic signatures of modern offshore detrital sediments from different climatic regimes and the implications

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Science China Earth Sciences 2024年第2期67卷 405-419页

作者： Jun MU Tianyu CHEN Qian YU shichao AN Jianfang CHEN xuefa shi Weiqiang LI State Key Laboratory for Mineral Deposits Research School of Earth Sciences and EngineeringNanjing UniversityNanjing210023China Ministry of Education Key Laboratory for Coast and Island Development School of Geography and Ocean ScienceNanjing UniversityNanjing210023China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou310012China Key Laboratory of Marine Geology and Metallogeny First Institute of OceanographyMinistry of Natural ResourcesQingdao266061China

Potassium isotopes are a novel tracer for continental *** K isotope studies on chemical weathering generally targeted weathering profiles under a particular climate region,yet the effects of chemical weathering on K isotopes under different climatic backgrounds remain ***,little is known about the K isotope signatures of modern unconsolidated detrital ***,we report K isotopic data of surficial seafloor sediments from continental shelves along the east coast of China(ECC),as well as those around the tropical Hainan island in the northern South China *** ECC sediments have a relatively narrow distribution ofδ^(41)K(with reference to NIST3141a)values,which range from(-0.40±0.01)‰to(-0.57±0.04)‰,with an average of(-0.51±0.09)‰.By contrast,δ^(41)K values of Hainan offshore sediments display a larger variation,ranging from(-0.28±0.07)‰to(-0.67±0.02)‰.Theδ^(41)K values of Hainan offshore sediments exhibit negative correlations with the chemical index of alteration(CIA),Al/K,Ti/K,and total iron(FeT),which underlines the control of chemical weathering on K isotopic signatures of detritus inputs into *** also measured Mg isotope compositions for the same samples;interestingly,the variability inδ^(26)Mg of the samples is small(~0.24‰)for all ECC and Hainan offshore sediments,andδ^(26)Mg values do not show clear correlations with indexes of chemical *** study demonstrates the link between K isotopic variability of detrital sediments and climatic conditions including rainfall intensity,which indicates that K isotopes of the detrital component of marine sediments could be applied to study Earth’s climate in deep ***δ^(41)K values of the offshore detrital sediments are significantly less variable than those of pelagic marine sediments,highlighting the importance of distinguishing the effects of diagenesis and neoformation of clay minerals from continental weathering in attempts to study deep-time climate-weathering

关键词： Potassium isotopes Magnesium isotopes Chemical weathering Detrital sediments Climatic regimes Mean annual precipitation

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Distribution, burial fluxes and carbon sink effect of sedimentary organic carbon in the eastern China seas

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Science China Earth Sciences 2024年第10期67卷 3062-3082页

作者： xuefa shi Bin WU Shuqing QIAO Zhengquan YAO Limin HU Yazhi BAI Shan HU Jie SHENG Yanguang LIU Shengfa LIU Kunshan WANG Jianjun ZOU Key Laboratory of Marine Geology and Metallogeny First Institute of Oceanography Ministry of Natural Resources Laboratory for Marine Geology Qingdao Marine Science and Technology Center Key Laboratory of Deep Sea Mineral Resources Development Shandong Province (Preparatory) Key Laboratory of Submarine Geosciences and Technology College of Marine Geosciences Ocean University of China

The ocean is the largest active carbon reservoir on Earth. Organic carbon（OC）, as the primary species of carbon sequestration in the ocean, plays an important role in the global carbon cycle through its deposition and burial. In this study,sedimentary OC data from 5796 stations, together with relevant geochemical and sedimentological parameters in the Bohai Sea,Yellow Sea, and East China Sea（BYES） were used to summarize and elucidate the distribution and burial patterns of sedimentary OC, and assess carbon sink effect of sedimentary OC burial. The results show that the OC content in the sediments of the BYES ranges from 0.00% to 2.12%, with an average content of 0.47%±0.26%. OC content is significantly correlated with finegrained sediments, with an average OC content in mud areas being 39% higher than that in non-mud areas. Modern OC buried in the BYES are mainly deposited in 7 major mud areas, with a total sedimentary OC burial flux of approximately 8.20 Mt C yr–*** them, the burial flux of biospheric OC is 6.92 Mt C yr–1, equivalent to the OC consumption amount of silicate weathering of the 9 major river basins in the eastern China. In its natural state, the annually sequestered OC in the sediments of the eastern China seas is equivalent to 25.37 Mt of atmospheric CO2, indicating a significant carbon sink effect. The distribution and burial of terrigenous OC in the BYES are mainly influenced by the large river inputs and complex marine hydrodynamic environment,while human activities such as dam construction have significantly altered the OC burial in these coastal mud areas.

关键词： Sedimentary organic carbon Burial flux Carbon sink effect Carbon cycle Eastern China seas

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海底高原与俯冲带相互作用的地质效应的研究进展

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地球科学进展 2024年第7期39卷 702-716页

作者：闫施帅鄢全树石学法袁龙自然资源部第一海洋研究所海洋地质与成矿作用重点实验室山东青岛266061 河海大学海洋学院江苏南京210098 山东省深海矿产资源开发重点实验室(筹) 山东青岛266061

全球俯冲汇聚系统中,俯冲输入组分包括正常大洋板块以及具浮力的海底高原等正地形,二者对俯冲带会产生迥异的地质效应,因此,深入开展海底高原与俯冲带相互作用研究对理解俯冲带地球动力学过程和陆壳侧向增生等地质过程具有重要意义。系... 详细信息

全球俯冲汇聚系统中,俯冲输入组分包括正常大洋板块以及具浮力的海底高原等正地形,二者对俯冲带会产生迥异的地质效应,因此,深入开展海底高原与俯冲带相互作用研究对理解俯冲带地球动力学过程和陆壳侧向增生等地质过程具有重要意义。系统总结了一些目前正处于关键俯冲带处的典型海底高原的地质与地球物理特征,结合俯冲带特征及数值模拟成果,深入探讨海底高原与俯冲带相互作用的地质效应。在俯冲带运动学和几何学方面,位于俯冲前缘的具浮力的海底高原等正地形通常会抵制俯冲,并可能造成俯冲带后撤和俯冲极性反转并形成新的俯冲带,甚至可能会终止俯冲并增生于成熟岛弧/陆壳边缘。然而,近年来的研究显示,部分海底高原的俯冲行为并没有终止,而是俯冲角度变缓呈现平板俯冲的样式,从而造成俯冲带地区上覆板块的构造缩短与增厚以及岩浆活动逐渐向板内迁移。在岩石地球化学方面,具富集地球化学特征的海底高原的俯冲消减不仅影响着壳幔圈层相互作用过程、岛弧—弧后熔岩的地球化学组分以及俯冲带地区热液矿床的形成,而且这些地质体的深俯冲也将对地幔不均一性的形成作出重要贡献。最后,指出未来会在海底高原深部精细结构及演化,岛弧及弧后盆地对“海底高原—海沟”新俯冲构造格局的地质响应,以及控制海底高原发生俯冲/增生的因素及其之间的定量关系等方面有较大的发展潜力。

关键词：海底高原俯冲带地质效应岩浆作用

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中太平洋海山群玄武岩磷酸盐化特征及其对全岩地球化学的影响

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海洋地质与第四纪地质 2024年第1期44卷 67-80页

作者：王世奇叶现韬张传林石学法河海大学海洋学院南京210098 自然资源部第一海洋研究所青岛266061

大洋玄武岩是研究地幔不均一性、岩浆起源与演化的重要对象。然而,由于其长期与周围的海水相互作用,极易发生蚀变和次生变化。磷酸盐化是大洋玄武岩最常见的次生变化之一,会影响到其全岩地球化学成分,且目前仍没有去除磷酸盐化的有效方... 详细信息

大洋玄武岩是研究地幔不均一性、岩浆起源与演化的重要对象。然而,由于其长期与周围的海水相互作用,极易发生蚀变和次生变化。磷酸盐化是大洋玄武岩最常见的次生变化之一,会影响到其全岩地球化学成分,且目前仍没有去除磷酸盐化的有效方法。因此,研究磷酸盐化特征以及评估其对玄武岩全岩地球化学成分的影响至关重要。本文以中太平洋海山群(九皋和紫檀海山)玄武岩为研究对象,通过能谱面扫描元素分布图、主量元素以及微量元素揭示玄武岩的磷酸盐化特征,评估磷酸盐化对其全岩主微量元素的影响。面扫描元素分布图显示,中太平洋海山群玄武岩的磷酸盐化作用主要发生在玄武岩气孔和裂隙周围,以交代早期的碳酸盐化基质,形成细小的磷酸盐矿物,呈浸染状分布在玄武岩基质中为特点,并且磷酸盐化会不同程度地改变玄武岩的主量元素和微量元素成分:比如磷酸盐化会使玄武岩的MgO、CaO、Na_(2)O、MnO含量降低,K_(2)O和Fe_(2)O_(3)T含量升高,同时也会对相容元素(如Cr、Co、Ni等)、大离子亲石元素(Rb、Ba、Cs等)和稀土元素造成不同程度的影响。值得注意的是,在磷酸盐化过程中,玄武岩的Al_(2)O_(3)、SiO_(2)和高场强元素(Nb、Ta、Zr、Hf和Ti)几乎不受影响。

关键词：玄武岩磷酸盐化全岩地球化学海山群中太平洋

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东南太平洋富稀土沉积早期成岩过程研究及其指示意义

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海洋学报 2024年第2期46卷 40-51页

作者：李杰军刘洪娜王小静李力石学法自然资源部第一海洋研究所海洋地质与成矿作用重点实验室山东青岛266061 崂山实验室海洋地质过程与环境功能实验室山东青岛266237 山东省深海矿产资源开发重点实验室山东青岛266061

富稀土深海沉积物作为一种潜在矿产资源,近年来备受关注。研究发现,稀土元素(REY)和钇(Y)元素的富集过程很可能发生在沉积物-海水界面(SWI),但目前针对富稀土沉积物的早期成岩过程研究较少。本研究采集了东南太平洋富稀土海区两个站位... 详细信息

富稀土深海沉积物作为一种潜在矿产资源,近年来备受关注。研究发现,稀土元素(REY)和钇(Y)元素的富集过程很可能发生在沉积物-海水界面(SWI),但目前针对富稀土沉积物的早期成岩过程研究较少。本研究采集了东南太平洋富稀土海区两个站位的沉积物短柱,解析了REY在SWI的早期成岩过程及其对REY在沉积物中富集机制的影响。孔隙水中较低的Fe、Mn和较高的Mo、U、V浓度表明研究区沉积物处于氧化环境。对比底层海水中REY,孔隙水中的REY呈中稀土(MREE)富集特征。沉积物中REY的主要富集相态为磷酸盐相,而孔隙水中REY及其配分模式可能受控于沉积物中磷酸盐的含量。本研究表明,在稀土元素早期成岩过程中,原本与铁锰相等其他相态结合的REY重新进入到孔隙水中,最终被磷酸盐相吸附和埋藏,早期成岩过程是深海沉积物中REY富集的重要机制。

关键词：早期成岩孔隙水稀土元素沉积物东南太平洋

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Petrologic perspectives on tectonic evolution of a nascent basin(Okinawa Trough) behind Ryukyu Arc: A review

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Acta Oceanologica Sinica 2014年第4期33卷 1-12页

作者： YAN Quanshu shi xuefa Key Laboratory of Marine Sedimentary and Environmental Geology the First Institute of OceanographyState Oceanic Administration

Okinawa Trough is a back-arc, initial marginal sea basin, located behind the Ryukyu Arc-Trench System. The formation and evolution of the Okinawa Trough is intimately related to the subduction process of the Philippine Sea Plate beneath the Eurasian Plate since the late Miocene. The tectonic evolution of the trough is similar to other active back-arcs, such as the Mariana Trough and southern Lau Basin, all of which are experiencing the initial rifting and subsequent spreading process. This study reviews all petrologic and geochemical data of mafic volcanic lavas from the Okinawa Trough, Ryukyu Arc, and Philippine Sea Plate, combined with geophysical data to indicate the relationship between the subduction sources （input） and arc or back-arc magmas （output） in the Philippine Sea Plate-Ryukyu Arc-Okinawa Trough system （PROS）. The results obtained showed that several components were variably involved in the petrogenesis of the Oki-nawa Trough lavas：sub-continental lithospheric mantle underlying the Eurasian Plate, Indian mid-oceanic ridge basalt （MORB）-type mantle, and Pacific MORB-type mantle. The addition of shallow aqueous fluids and deep hydrous melts from subducted components with the characteristics of Indian MORB-type mantle into the mantle source of lavas variably modifies the primitive mantle wedge beneath the Ryukyu and sub-continental lithospheric mantle （SCLM） beneath the Okinawa Trough. In the northeastern end of the trough and arc, instead of Indian MORB-type mantle, Pacific MORB-type mantle dominates the magma source. Along the strike of the Ryukyu Arc and Okinawa Trough, the systematic variations in trace element ratios and isotopic compositions reflect the first-order effect of variable subduction input on the magma source. In general, petrologic data, combined with geophysical data, imply that the Okinawa Trough is experiencing the＂seafloor spreading＂process in the southwest segment,＂rift propagation＂process in the middle seg-ment, and＂crustal extensi

关键词： nascent ocean basin spreading tectonic evolution petrology geochemistry Okinawa Trough

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深海黏土定年研究进展

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海洋地质与第四纪地质 2024年第2期44卷 183-198页

作者：贺湘锋刘建兴毕东杰高建华石学法南京大学地理与海洋科学学院南京210023 自然资源部第一海洋研究所自然资源部海洋地质与成矿作用重点实验室青岛266061 青岛海洋科技中心海洋地质过程与环境功能实验室青岛266237

深海黏土广泛分布在水深超过碳酸盐补偿深度(CCD)以下的大洋盆地中,其沉积速率十分缓慢,只有少量的生物组分(主要是生物磷灰石)被保存,通常具有较高的稀土元素含量;海洋沉积物常用的磁性地层与生物地层相结合的定年手段通常不能有效使... 详细信息

深海黏土广泛分布在水深超过碳酸盐补偿深度(CCD)以下的大洋盆地中,其沉积速率十分缓慢,只有少量的生物组分(主要是生物磷灰石)被保存,通常具有较高的稀土元素含量;海洋沉积物常用的磁性地层与生物地层相结合的定年手段通常不能有效使用。因此,深海黏土沉积年龄框架的建立一直存在巨大的困难和挑战,严重阻碍了对沉积环境演化和稀土超常富集机制等方面的深入研究。本文回顾总结了20世纪以来逐步发展应用的多种深海黏土定年方法,主要包括磁性地层、鱼牙87Sr/86Sr定年、鱼牙U-Pb定年、10Be测年、230Thex测年、187Os/188Os定年、鱼鳞石生物地层、恒定Co通量模型以及常用的地层对比方法。这些方法各具优缺点,单一使用以上任何一种定年方法几乎都难以获得完整可靠的年龄框架。因此,综合运用多种定年方法,对获得的年龄框架进行系统对比和验证,将会更为有效地提高深海黏土年龄框架的可靠性。

关键词：深海黏土定年方法磁性地层鱼牙/鱼鳞石综合年代学

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南大西洋赤狐热液区硫化物特征及成矿机制

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海洋科学进展 2024年第2期42卷 296-311页

作者：张琦李兵刘季花李传顺王赛石学法自然资源部第一海洋研究所山东青岛266061 海洋地质与成矿作用自然资源部重点实验室山东青岛266061 山东省深海矿产资源开发重点实验室山东青岛266061

赤狐热液区是中国科研人员在南大西洋中脊首次发现的拆离断层型热液区。该区位于拆离断层的下盘,目前发现2个热液点,围岩类型为基性玄武岩。利用ICP-OES、ICP-MS、LA-ICP-MS等方法对2019年获得赤狐热液区硫化物样品开展详细的矿物学和... 详细信息

赤狐热液区是中国科研人员在南大西洋中脊首次发现的拆离断层型热液区。该区位于拆离断层的下盘,目前发现2个热液点,围岩类型为基性玄武岩。利用ICP-OES、ICP-MS、LA-ICP-MS等方法对2019年获得赤狐热液区硫化物样品开展详细的矿物学和地球化学研究,结果显示该区包括块状、角砾状、浸染状三类硫化物。与其他拆离断层型热液区相比,赤狐热液区上2个热液点具有明显不同的化学特征;全岩的主微量、黄铁矿的微量元素以及热液区硫化物的硫同位素特征明显指示,赤狐热液区可能受到基性与超基性岩的共同影响。热液区2个热液点的差异指示了同一个热液系统不同时期产出硫化物有差异及遭受后期改造的不同。

关键词：南大西洋中脊赤狐热液区热液硫化物拆离断层硫同位素

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The reverse sediment transport trend between abandoned Huanghe River(Yellow River) Delta and radial sand ridges along Jiangsu coastline of China——an evidence from grain size analysis

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Acta Oceanologica Sinica 2012年第6期31卷 83-91页

作者： LIU Tao shi xuefa LI Chaoxina YANG Gang Key Laboratory of Marine Geology and Environment Institute of Oceanology Chinese Academy of SciencesQingdao 266071China Guangxi Mangrove Research Center Beihai 536007China Key Laboratory of Marine Resources and Environmental Geology State Oceanic AdministrationQingdao 266061China Key Laboratory of Marine Resources and Environmental Geology State Oceanic AdministrationQingdao 266061China

To reveal the sediment transporting mechanism between the abandoned Huanghe River （Yellow River） Delta and radial sand ridges, “End Member” Model and grain size trend analysis have been employed to separate the “dynamic populations” in the surficial sediment particle spectra and to determine the possible sediment transporting pathway. The results reveal four “dynamic subpopulations”（EM1 to EM4） and two reverse sediment transporting directions： a northward transport tend from the radial sand ridges to mud patch, and a southward transport trend in deep water area outside the mud patch. Combined with the published hydrodynamic information, the transporting mechanism of dynamic populations has been discussed, and the main conclusion is that the transporting of finer subpopulations EM1 and EM2 is controlled by the “anticlockwise residual current circulation” forming during tidal cycle, which favor a northward transporting trend and the forming of mud patch on the north of radial sand ridges, while the transporting of coarser EM3 is mainly controlled by wind driven drift in winter, which favors a southward transporting direction.

关键词： radial sand ridges sediment transport grain size trend analysis end member model

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